(A)  maybe more or less than the true weight

(B) more than the true weight

(C) less than the true weight

(D) equal to the true weight

(A) stone chips

(B) steel

(C) glass_wool

(D) glass pieces

(A) will increase

(B)  will decrease

(C) dose not change

(D) varies with the increase of depth of the immersion of their piece

(A) kinetic energy

(B) weight

(C) potential energy

(D) impulse

(A) surface tension

(B) capillarity

(C) viscosity

(D) diffusion

(A) scattering

(B) interference

(C) total internal reflecction

(D) refraction

(A) stoning

(B) bolting

(C) thunder

(D) cloud clash

(A) it has well-defined cleavage planes

(B) it has a very high transparency

(C) it has a very high refractive index

(D) it is very hard

(A) warm and moist

(B) cool and dry

(C) warm and dry

(D) cool and moist

(A) velocity

(B) frequency

(C) wavelength

(D) amplitude